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Editorial Team
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Asked: 2026-05-27T11:23:26+00:00

In a system running kernel version 2.6.38 I see this sysfs file which shows

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In a system running kernel version 2.6.38 I see this sysfs file which shows the current clock source (happens to be tsc) /sys/devices/system/clocksource/clocksource0/current_clocksource

But looks like this sysfs file was introduced recently. In 2.6.9 I don’t see this file. In versions that doesn’t have this sysfs is there an easy to see the clock source ? When I compare the clock_gettime() ouptputs in these versions 2.6.9 seems to be at microseconds granularity and 2.6.38 is at nanoseconds granularity. Hence wondering what the clock source in 2.6.9 is..

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  1. Editorial Team

    You could try grepping clocksource and TSC from dmesg output.

    FWIW, the high-resolution timers (which enabled nanosecond resolution, among many other things) were introduced in the 2.6.21 kernel or thereabouts; older kernels don’t have that, as you have found out.

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